SA.4 Systems Approach To Designing

Question 1

System diagrams

Answer 1

Should include input, process, output
See images

Question 2

System symbols

Answer 2

See images

Question 3

Light dependent resistor (LDR)

Answer 3

INPUT
Detects change in light. Res increases in dark & decreases in light
Uses: security lights

Question 4

Pressure sensor

Answer 4

INPUT
Detects change in pressure in gas or liquid

Question 5

Switch

Answer 5

INPUT
Turn circuit on & off

Question 6

Temperature sensor

Answer 6

INPUT
Detects change in temp. When temp increases, res decreases

Question 7

Resistor

Answer 7

PROCESS
Used to limit flow of current

Question 8

Microcontroller

Answer 8

PROCESS
Programmable chip used in electrical products sa washing machines

Question 9

Flowcharts

Answer 9

See images

Question 10

Flowcharts

Answer 10

See images

Question 11

Buzzer

Answer 11

OUTPUT
Gives a sound output. Electromagnetic wires turn a circuit on & off to create a buzz
Uses: doorbells

Question 12

Light emitting diode (LED)

Answer 12

OUTPUT
A low power light output given

Question 13

Lamp

Answer 13

OUTPUT
Uses electricity to produce light of varying levels

Question 14

Speaker

Answer 14

OUTPUT
Translates electrical signal into an audible sound